diff --git a/src/main/java/com/google/gerrit/client/patches/UnifiedDiffTable.java b/src/main/java/com/google/gerrit/client/patches/UnifiedDiffTable.java
index 642aa7aa25..8204ac428d 100644
--- a/src/main/java/com/google/gerrit/client/patches/UnifiedDiffTable.java
+++ b/src/main/java/com/google/gerrit/client/patches/UnifiedDiffTable.java
@@ -77,6 +77,8 @@ public class UnifiedDiffTable extends AbstractPatchContentTable {
   }
 
   public void display(final List<PatchLine> list) {
+    initVersions(2);
+
     final StringBuilder nc = new StringBuilder();
     for (final PatchLine pLine : list) {
       appendLine(nc, pLine);